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Change U8900, just in case...

Did you try known good BIOS? You should expect C9560 failure, before Nvidia. Seems that is not the case here.

Dificult to confirm. Many of your readings are higher than refference board. You can't expect exact same readings, but some of them are too high. Worth to try heating U7700/8100 with quality flux first. Just in case of accumularted crap underneath. Even M2 area may be affected.

Possibly bad U8100...

820-3787 can be converted from discrete to UMA in the same manner as 820-3332 (2013). Must force backlight adjust signal, to avoid wake from sleep issue: - remove R7780 and inject 3V3_S0 to LCD_BKLT_PWM_R.

Find convenient test points on adjacent components. Do not check the rails marked as "NC_"

You can try disabling GPU. Changing the FDMF6808N chips is another option. Any error pops up, starting in diagnostic mode?

What schematic are you using? U8100 is BGA chip. https://drive.google.com/file/d/1TCD4YwJu2eY5kGm4TyI_q-kFOO_ubvET/view?usp=drive_link BTW, don't waste time checking, or writing down ground pins.

First be sure R5710/11 are both good. Next check U5700 voltages from page 34 (left side).

Did you measure diode mode with red probe connected to ground? Check MPMU LDOs at page 38. Do you get all voltages there?

Why not, if has USON 3x4mm? "Connect 3v3 side to Medusa and solder a 1v8 ROM onto this board." Connect 3V3 side to your programmer, instead of Medusa.

You should get the correct chip...

Yes, it works. It is explained on the product page.

Just in case, try known good BIOS (clean ME).

L7811/13/14?

Be aware, is 1V8 chip...

0.026 looks good; value varies, depending of SSD capacity. U7700/8100 LDOs are pulsing too? You may have problems with one of them, or even U5700. Any history available? BTW, forget the "V" after a diode mode reading. Avoid a confusion with voltage reading.

Looks like 3V3_S5 is enabled, so you should have L7610 voltage. If not, check all components L/Q7610 related. Did you use "C" version for U7600?

Don't bothr with Q8470 if you get stable 12V_S5_FET voltage. S5 LED (LE0301) must come on. If not, check U7600 voltages; you may need to change it. BTW, did you test removing CMOS cell?

Did you check with LIO board disconnected always?